Proton Magnetic Resonance Spectra of Vinylmethylsilanes

Abstract

Protonmagnetic resonance spectra of vinyltrimethylsilane and divinyldimethylsilane in dilute cyclohexane solution, at 40 Mc/sec, have been analyzed and the parameters compared with those obtained for alkylethylenes under similar conditions. The results indicate the presence of d π—p π structures in these silanes. Additional anisotropy effects due to the presence of Si may also be involved but are believed not to be solely responsible for the effects observed. All the vinyl coupling constants are considerably greater than those observed in the alkenes, but are comparable to values obtained for molecules containing vinyl‐metal bonds.